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1st im sure the alarm stopped working because the power locks dont work (feedback issue) next on some models water from rain or car washes gets down inisde doors and shorts out electric devices in door , with that many things out im sure your gonna find a fuse blown in your panel , but i'll further bet that new fuse will go again next rain as well .

no country stated.
nor if its factory or aftermarket alarm
making a very old alarm work right , with no books is a problem.
its just a computer, programmed to be and alarm and will only
work right when all sensors work prefect.
and is unlikely after, 24 years of rain and dirt and rust.
very hard to fix. (and i know how. )

our dealership had a small independent company come in and fix our chrysler cars and vans of water leaks.his company was called " The Water Doctor"'Most leaks are not from door seals or windows seals,But from pinch welds when they built the cars.You might want to call other dealers not just a Buick dealer to see if they have someone like this they call in,

You'll probably find that the alarm control unit got wet - it is sometimes located under the drivers or passengers seat, or under the kickpanels/dash - You may find that it dries up and works OK, or never works right again - I'd recommend fixing the leak first, then moving on to the alarm system... I'd be cautious with introducing H20 to the alarm control unit, as they can disable the vehicle from starting or running...

easiest fix is cut wire to siren and install switch in wire and turn off if u know its going to rain, sounds like there is a wire exposed that when it gets wet it trips alarm does this happen when running or only when off?

the central locking control unit is in the drivers door. there's a polythene sheet in the door panel. If that's ripped or petrified then rain may be screwing with the electrics. it may be worth taking off the door panel and wrapping it the controll unit in a shopping bag or summat.....